(2E,7E)-2,7-Bis[(thio-phen-2-yl)methyl-idene]cyclo-hepta-none.

The whole molecule of the title compound, C17H16OS2, is generated by two-fold rotational symmetry. The carbonyl C and O atoms of the cycloheptanone ring lie on the twofold rotation axis which bisects the opposite -CH2-CH2- bond of the ring. The mol-ecule exists in an E,E conformation with respect to the C=C double bond. The cyclo-hepta-none ring exhibits a twisted chair conformation and its mean plane makes a dihedral angle of 50.12 (19)° with the planes of the thio-phene rings. The two S atoms are in an anti arrangement with respect the carbonyl O atom and the dihedral angle between the two thio-phene ring planes is 69.38 (7)°. In the molecule, there are two intramolecular C-H⋯S hydrogen bond, forming S(6) ring motifs. In the crystal, inversion dimers are generated via pairs of C-H⋯O hydrogen bonds. These dimers are inter-connected by another inter-action of the same kind with a neighbouring mol-ecule, forming a mol-ecular chain along the c-axis direction.